海思3518EV200 SDK中获取和保存H.264码流详解

     /******************************************
      step 2:  Start to get streams of each channel.
     ******************************************/
     while (HI_TRUE == pstPara->bThreadStart)
     {
         FD_ZERO(&read_fds);
         for (i = ; i < s32ChnTotal; i++)
         {
             FD_SET(VencFd[i], &read_fds);
         }

         TimeoutVal.tv_sec  = ;
         TimeoutVal.tv_usec = ;
         s32Ret = select(maxfd + , &read_fds, NULL, NULL, &TimeoutVal);//select非阻塞
         if (s32Ret < )
         {
             SAMPLE_PRT("select failed!\n");
             break;
         }
         else if (s32Ret == )
         {
             SAMPLE_PRT("get venc stream time out, exit thread\n");
             continue;
         }
         else
         {
             for (i = ; i < s32ChnTotal; i++)
             {
                 if (FD_ISSET(VencFd[i], &read_fds))
                 {
                     /*******************************************************
                      step 2.1 : query how many packs in one-frame stream.
                     *******************************************************/
                     memset(&stStream, , sizeof(stStream));
                     s32Ret = HI_MPI_VENC_Query(i, &stStat);
                     if (HI_SUCCESS != s32Ret)
                     {
                         SAMPLE_PRT("HI_MPI_VENC_Query chn[%d] failed with %#x!\n", i, s32Ret);
                         break;
                     }

                     /*******************************************************
                     step 2.2 :suggest to check both u32CurPacks and u32LeftStreamFrames at the same time,for example:
                      if(0 == stStat.u32CurPacks || 0 == stStat.u32LeftStreamFrames)
                      {
                         SAMPLE_PRT("NOTE: Current  frame is NULL!\n");
                         continue;
                      }
                     *******************************************************/
                     if( == stStat.u32CurPacks)
                     {
                           SAMPLE_PRT("NOTE: Current  frame is NULL!\n");
                           continue;
                     }
                     /*******************************************************
                      step 2.3 : malloc corresponding number of pack nodes.
                     *******************************************************/
                     stStream.pstPack = (VENC_PACK_S*)malloc(sizeof(VENC_PACK_S) * stStat.u32CurPacks);
                     if (NULL == stStream.pstPack)
                     {
                         SAMPLE_PRT("malloc stream pack failed!\n");
                         break;
                     }

                     /*******************************************************
                      step 2.4 : call mpi to get one-frame stream
                     *******************************************************/
                     stStream.u32PackCount = stStat.u32CurPacks;
                     s32Ret = HI_MPI_VENC_GetStream(i, &stStream, HI_TRUE);
                     if (HI_SUCCESS != s32Ret)
                     {
                         free(stStream.pstPack);
                         stStream.pstPack = NULL;
                         SAMPLE_PRT("HI_MPI_VENC_GetStream failed with %#x!\n", \
                                s32Ret);
                         break;
                     }

                     /*******************************************************
                      step 2.5 : save frame to file
                     *******************************************************/
                     s32Ret = SAMPLE_COMM_VENC_SaveStream(enPayLoadType[i], pFile[i], &stStream);
                     if (HI_SUCCESS != s32Ret)
                     {
                         free(stStream.pstPack);
                         stStream.pstPack = NULL;
                         SAMPLE_PRT("save stream failed!\n");
                         break;
                     }
                     /*******************************************************
                      step 2.6 : release stream
                     *******************************************************/
                     s32Ret = HI_MPI_VENC_ReleaseStream(i, &stStream);
                     if (HI_SUCCESS != s32Ret)
                     {
                         free(stStream.pstPack);
                         stStream.pstPack = NULL;
                         break;
                     }
                     /*******************************************************
                      step 2.7 : free pack nodes
                     *******************************************************/
                     free(stStream.pstPack);
                     stStream.pstPack = NULL;
                 }
             }

重点在这里,调用API获取H.264视频流并保存

                     /*******************************************************
                      step 2.4 : call mpi to get one-frame stream
                     *******************************************************/
                     stStream.u32PackCount = stStat.u32CurPacks;
                     s32Ret = HI_MPI_VENC_GetStream(i, &stStream, HI_TRUE);
                     if (HI_SUCCESS != s32Ret)
                     {
                         free(stStream.pstPack);
                         stStream.pstPack = NULL;
                         SAMPLE_PRT("HI_MPI_VENC_GetStream failed with %#x!\n", \
                                s32Ret);
                         break;
                     }

                     /*******************************************************
                      step 2.5 : save frame to file
                     *******************************************************/
                     s32Ret = SAMPLE_COMM_VENC_SaveStream(enPayLoadType[i], pFile[i], &stStream);
                     if (HI_SUCCESS != s32Ret)
                     {
                         free(stStream.pstPack);
                         stStream.pstPack = NULL;
                         SAMPLE_PRT("save stream failed!\n");
                         break;
                     }

1)HI_MPI_VENC_GetStream(i, &stStream, HI_TRUE);

HiMPP IPC V2.0 媒体处理软件开发参考P540

2）s32Ret = SAMPLE_COMM_VENC_SaveStream(enPayLoadType[i], pFile[i], &stStream);